Flask 10（Flask-RESTful）

小灰灰 2023-10-08 12:04 50阅读 0赞

#### Flask 接口 ####

*   *  写在前面
     *  1、Flask-RESTful开始
     *   *  1.1、新建一个flask项目
         *  1.2、开始使用Flask-RESTful
         *  1.3、json序列化器
         *  1.4、级联嵌套序列化
         *  1.5、列表级联嵌套序列化
         *  1.6、序列化模板
     *  2、Flask-RESTful 的 abort（）
     *  3、Flask-RESTful 请求转换

### 写在前面 ###

Flask-RESTful官方文档

> https://flask-restful.readthedocs.io/en/latest/

安装Flask-RESTful

> pip install flask-restful

### 1、Flask-RESTful开始 ###

#### 1.1、新建一个flask项目 ####

首先得安装一下这几个包

# rest
    pip install flask-restful
    # 插件
    pip install flask-script
    # mysql
    pip install pymysql
    # mysql驱动
    pip install flask-sqlalchemy
    # 迁移
    pip install flask-migrate
    # 缓存
    pip install flask_caching
    # reids
    pip install redis

目录结构  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70]  
这里我把app.py改成了manage.py

App/\_ *init* \_.py里面的代码

from App.ext import init_ext
    from App.settings import envs
    from App.views import init_blue
    from flask import Flask
    
    
    def create_app(env):
        app = Flask(__name__)
        app.config.from_object(envs.get(env))
        init_ext(app)
        init_blue(app)
        return app

App/ext.py里面的代码

from flask_migrate import Migrate
    from flask_sqlalchemy import SQLAlchemy
    from flask_caching import Cache
    
    db = SQLAlchemy()
    migrate = Migrate()
    cache = Cache(
        config={
        
            "CACHE_TYPE": "redis"
        }
    )
    
    
    def init_ext(app):
        db.init_app(app)
        migrate.init_app(app, db)
        cache.init_app(app)

App/models.py里面的代码：目前为空

App/settings.py里面的代码

import os
    
    BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
    
    def get_db_url(dbinfo):
        engine = dbinfo.get("ENGINE") or "sqlite"
        driver = dbinfo.get("DRIVER") or "sqlite"
        user = dbinfo.get("USER") or ""
        password = dbinfo.get("PASSWORD") or ""
        host = dbinfo.get("HOST") or ""
        port = dbinfo.get("PORT") or ""
        name = dbinfo.get("NAME") or ""
    
        return "{}+{}://{}:{}@{}:{}/{}".format(engine, driver, user, password, host, port, name)
    
    
    class Config:
        # 开发环境
        DEBUG = False
        # 测试环境
        TESTING = False
        # 数据库
    
        SQLALCHEMY_TRACK_MODIFICATIONS = False
    
        SECRET_KEY = "123456789"
    
        SESSION_TYPE = "redis"
    
    
    # 开发环境
    class DevelopConfig(Config):
        DEBUG = True
    
        dbinfo = {
        
            "ENGINE": "mysql",
            "DRIVER": "pymysql",
            "USER": "root",
            "PASSWORD": "root",
            "NAME": "Flaskrest",
            "HOST": "localhost",
            "PORT": "3306",
        }
    
        SQLALCHEMY_DATABASE_URI = get_db_url(dbinfo)
    
    
    # 测试环境
    class TestConfig(Config):
        TESTING = True
    
        dbinfo = {
        
            # 什么数据库
            "ENGINE": "mysql",
            # 驱动名
            "DRIVER": "pymysql",
            # 数据库用户名
            "USER": "root",
            # 密码
            "PASSWORD": "root",
            # 创建的库名
            "NAME": "Flaskrest",
    
            "HOST": "localhost",
            "PORT": "3306",
        }
    
        SQLALCHEMY_DATABASE_URI = get_db_url(dbinfo)
    
    
    # 演示环境
    class StagingConfig(Config):
        dbinfo = {
        
            # 什么数据库
            "ENGINE": "mysql",
            # 驱动名
            "DRIVER": "pymysql",
            # 数据库用户名
            "USER": "root",
            # 密码
            "PASSWORD": "root",
            # 创建的库名
            "NAME": "Flaskrest",
    
            "HOST": "localhost",
            "PORT": "3306",
        }
    
        SQLALCHEMY_DATABASE_URI = get_db_url(dbinfo)
    
    
    # 生产环境
    class ProductConfig(Config):
        DEBUG = True
    
        dbinfo = {
        
            # 什么数据库
            "ENGINE": "mysql",
            # 驱动名
            "DRIVER": "pymysql",
            # 数据库用户名
            "USER": "root",
            # 密码
            "PASSWORD": "root",
            # 创建的库名
            "NAME": "Flaskrest",
    
            "HOST": "localhost",
            "PORT": "3306",
        }
    
        SQLALCHEMY_DATABASE_URI = get_db_url(dbinfo)
    
    
    envs = {
        
        "develop": DevelopConfig,
        "testing": TestConfig,
        "staging": StagingConfig,
        "product": ProductConfig,
        "default": DevelopConfig
    }

manage.py里面的代码

from App import create_app
    from flask_migrate import MigrateCommand
    from flask_script import Manager
    import os
    
    env = os.environ.get('FLASK_ENV', "develop")
    app = create_app(env)
    
    
    manager = Manager(app)
    manager.add_command("db", MigrateCommand)
    
    if __name__ == '__main__':
        manager.run()

创建数据库

> 登录mysql：mysql -uroot -proot;

> 建库：create database Flaskrest charset=utf8;

#### 1.2、开始使用Flask-RESTful ####

创建App/apis.py

from flask_restful import Api, Resource
    
    api = Api()
    
    
    def init_api(app):
        api.init_app(app)
    
    
    class Hello(Resource):
        def get(self):
            return {
        "msg": "Hello World"}
    
    
    api.add_resource(Hello, '/hello/')

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 1]  
运行并访问  
![在这里插入图片描述][20200301190809438.png]  
post请求实例：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 2]  
打开postman工具，访问  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 3]  
get传参实例  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 4]

#### 1.3、json序列化器 ####

用装饰器例:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 5]  
用函数例：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 6]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 7]

#### 1.4、级联嵌套序列化 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 8]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 9]  
访问结果  
![在这里插入图片描述][2020030121060637.png]

#### 1.5、列表级联嵌套序列化 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 10]  
访问结果  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 11]  
如果不用装饰器，可以直接返回marshal  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 12]

#### 1.6、序列化模板 ####

给字段后面加attribute属性，可以改变字段名（相当于取别名）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 13]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 14]  
序列化模板可以添加默认值属性default  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 15]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 16]  
添加url  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 17]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 18]

### 2、Flask-RESTful 的 abort（） ###

用法  
![在这里插入图片描述][20200301221946370.png]  
源码  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 19]

### 3、Flask-RESTful 请求转换 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 20]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 21]  
这样args就代替了request.form  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 22]  
它可以用来做校验  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 23]  
比如这里我们不给参数访问  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 24]  
它的其他各种用法：可以在各种位置取各种参数![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 25]

> 本文学习笔记截至P412，18:15

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[2020030121060637.png]: https://img-blog.csdnimg.cn/2020030121060637.png
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